Polyester. Made in China. Extra Large 79"" x 79"" picnic blanket fits 6-8 people sitting or 4 people lying down. Rolls up to 16"" cylinder with 9"" diameter. Waterproof and sandproof Peva backing keeps out moisture, dirt and sand. 3-layer structure with soft top fiber, middle foam for comfort, and waterproof bottom layer. Lightweight and foldable with adjustable belt and hand strap for easy carrying. Suitable for picnic, camping, hiking, beach, park, outdoor concert, and indoor use as playing mat. Weight: 2.42 pounds.